上传Bom文件
AiBOM
登录
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
0
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
74HCT163N,652 VS 74HCT163N
74HCT163N VS CD74HCT163MG4
74HCT163N VS CD74HCT163MTG4
74HCT163N VS CD74HCT163M96G4
74LVTH162244ZQLR VS SN74LVT162244AGQLR
74ABT08DB VS 74ABT08DB,112
74ABT08D,118 VS 74ABT08DB,112
74ABT08D,112 VS 74ABT08DB,112
74ABT08DB,118 VS 74ABT08DB
74ABT08D,118 VS 74ABT08DB,118
74ABT08D,112 VS 74ABT08DB,118
74LVTH162373ZQLR VS SN74LVTH162373KR
74HC73PW,112 VS 74HC73PW
74HC73PW,112 VS MC74HC74ADR2
74HC73PW,112 VS 74ABT74N
74AC174PC VS 54AC174DMQB
74HC00PW,112 VS 74HC03PW,118
74HC03PW,118 VS MC74HC00ADTR2
74HC03PW,118 VS MM74HC00MTC
74HC03PW,118 VS 74HC00PW,118
74HC03PW,118 VS 74HC00PW
74HC03PW,118 VS 74HC00T14-13
74VHCT373ASJ VS 74VHCT373ASJX
74ACT163SJX VS SN74F163ADR
74AHCT138PW,118 VS 74HCT238D
74LVT74PW,118 VS 74LVT74PW
74LVT74PW,112 VS 74LVT74PW
74LVT74D,112 VS 74LVT74PW
74HCT03D,652 VS CD74HCT03ME4
74HCT03D,653 VS CD74HCT03ME4
74ALVCH16832DGG:11 VS 74ALVCH16832DGGRE4
74ALVCH16832DGG:11 VS 74ALVCH16832DGGRG4
74ALVCH16832DGGRE4 VS 74ALVCH16832DGGRG4
74ALVCH16832DGG,11 VS 74ALVCH16832DGGRG4
74HC107N VS 74HC74PW,118
74HC107N VS MM74HC74AMTCX
74HC107N VS 74HC74PW
74HC107N VS MM74HC74AMTC
74LVC1G86GV,125 VS 74LVCE1G86SE-7
74LVC1G86GV VS 74LVCE1G86SE-7
74LX1G86STR VS 74LVCE1G86SE-7
74LVC1G86W5-7 VS 74LVCE1G86SE-7
74HC42D,653 VS SN74HC42DRE4
74HC42D,653 VS SN74HC42DTE4
74HC42D,653 VS SN74HC42DE4
74FCT374CTQG VS CY74FCT374ATQCTG4
74FCT374ATQG VS CY74FCT374ATQCTG4
74LVC1G34GF VS 74LVC1G34GF,132
74LVC1G34GF,132 VS 74LVC1G34GF,132
74LVC1G34GM,115 VS 74LVC1G34GF,132
74LVC1G34GM,132 VS 74LVC1G34GF,132
74LVC1G34GM,115 VS 74LVC1G34GM,132
74LVC1G34GM,132 VS 74LVC1G34GM,132
74LVC1G34GF,132 VS 74LVC1G34GM,132
74LVC1G34GM,132 VS 74LVC1G34GM,115
74LVC1G34GM,115 VS 74LVC1G34GM,115
74LVC1G34GF,132 VS 74LVC1G34GM,115
74ACT157PC VS CD74ACT157EE4
74ACT157PC VS 5962-8968801EA
74LV373N,112 VS 74LV373N
72215LB15PF8 VS 72215LB15PF
72215LB15PF8 VS CY7C4215-15AXI
72215LB15PF8 VS CY7C4215-15AC
72211L10J8 VS 72211L10JG
72211L10J8 VS 72211L10J
74AC11138N VS DM74145N
74F534SC VS N74F534D
74ABT2244DB,112 VS 74LCX244WM
74ABT2244DB,112 VS 74LCX244MTCX
74ABT2244DB,112 VS 74LCX244MTC
74ABT241CSJX VS 74ABT241CSC
74ABT241CSJX VS SN74ABT2241DWE4
74ABT241CSJX VS SN74ABT241ADWRG4
74ABT241CSJX VS SN74ABT2241DWRE4
74ABT241CSJX VS SN74ABT241ADWG4
74AUP1G86GM,132 VS 74AUP1G86GM,132
74AUP1G86GM,115 VS 74AUP1G86GM,132
74AUP1G86GF,132 VS 74AUP1G86GM,132
74ABT646AD,112 VS SN74ABT646NT
74AUP1G86GF,132 VS 74AUP1G86GF,132
74AUP1G86GM,132 VS 74AUP1G86GF,132
74AUP1G86GM,115 VS 74AUP1G86GF,132
74AUP1G86GM,132 VS 74AUP1G86GM,115
74AUP1G86GM,115 VS 74AUP1G86GM,115
74AUP1G86GF,132 VS 74AUP1G86GM,115
74HCT132D VS MM74HC00MX
74HC132D VS MM74HC00MX
74HCT85D,653 VS 74HC85D,653
74HC138D,653 VS MM74HC138MX
74LVC827APW,118 VS SN74LVC827ADBRG4
74HC164D,652 VS 74HC164D
74LVTH245MTCX VS 74LVT245MTC
74AHC125PW VS 74VHC125MTCX
74VHC125MTCX VS 74AHC126S14-13
74HC138D,653 VS MM74HC138M
74LV139DB,112 VS 74VHC139M
74HC85D,653 VS 74HCT85D,653
74ACT245MTC VS 74ACT245MTCX
74ACT245TTR VS 74ACT245MTCX
74HC08D,652 VS 74HC08D
74HC74PW VS MM74HC74AMTCX
74HC85D,653 VS 74HC283PW,118
74HCT132D,653 VS 74HCT132D
74LV139DB,112 VS 74AHC139D,118
74HC165D,652 VS 74HC165D,653
74AC139MTCX VS 74HCT238D
74AC139MTCX VS 74ACT138SCX
74HCT125N,652 VS CD74HCT125EE4
74VHC138SJ VS 74VHC138M
74VHC138SJX VS 74VHC138M
74LVX08MX VS 74LVX08MX
74LVC1G126GV,125 VS 74LVC1G126GW
74LCX573MTC VS 74LCX573MTCX
74F151APC VS 54F151ADMQB
74F151APC VS 74F151ASC
74AHC126S14-13 VS 74AHC125T14-13
74AHC125PW VS 74AHC126S14-13
74AHC125PW VS 74AHC125T14-13
74LVC06AD,118 VS 74LVC06AD,112
74LCX06MX VS 74LVC06AD,112
74LCX06M VS 74LVC06AD,112
74LVC06AD,112 VS 74LVC06AS14-13
74HCT390DB,118 VS 5962-9098401MEA
74HC4020PW,118 VS SN74HC4060PW
74HC4020PW,118 VS SN74HC4060PWG4
74HC259PW,118 VS 74HCT112D
74HC259PW,118 VS 74HC259D
74ABT245PW,112 VS SN74ABT245BPWR
74HC02D,653 VS 74HC02D,652
74HC138D,653 VS MM74HC138MX
74HC138D,653 VS MM74HC138M
74HC138D,653 VS 74HC138D,653
74VHC139MX VS 74LV139D
74VHC139MX VS 74LV139DB,112
74VHC139M VS 74LV139DB,112
74HC137D,653 VS SN74HCT138DR
74HC4020D,653 VS 74HC393D
74LVX138MTCX VS 74HCT238D
74HC138D,652 VS 74HC138D,653
74ACT138SCX VS 74HCT238D
74HC4020D,652 VS 74HC4060D
74HC4020D,652 VS 74HC4017D
74HC165D,653 VS 74HC165D,653
74HC74PW,118 VS 74HC74PW
74HC74PW VS MM74HC74AMTC
74HCT132N VS 74HCT132D
74HCT132N VS 74HC132D
74HCT132N VS MM74HC00M
74HCT132N VS 74HC00D
74ACT08SC VS 74ACT08SCX
74LV139DB,112 VS 74LV139D
74LV139DB,112 VS SN74LV139ADRE4
74VHC08MTR VS 74LV08D
74LVT245MTCX VS 74LVT245MTC
74LVT245MTC VS 74LVTH245MTCX
74VHC125MTCX VS 74AHC125PW
74VHC125MTCX VS 74AHC126S14-13
74HC4040PW,118 VS 74HC4017D
74HC4040PW,118 VS 74HC40103D
74LVC07APW-T VS 74LCX07MTCX
74LCX07MTCX VS 74LCX07MTC
74VHC139MTR VS 74LV139D
74LV139DB,112 VS 74VHC139MTR
74HCT00D,652 VS 74HCT132D
74LVC1G125DCKRE4 VS SN74LVC1G125DCKT
74LVC1G125DCKRG4 VS SN74LVC1G125DCKT
74LVC1G125DCKRE4 VS 74LVC1G125DCKTE4
74LVC1G125DCKRE4 VS 74LVC1G125DCKTG4
74LVC1G125DCKRE4 VS 74LVC1G125DCKRG4
74LVC1G125DCKTE4 VS 74LVC1G125DCKTG4
74LVC1G125DCKRG4 VS 74LVC1G125DCKTE4
74LVC1G175DBVRE4 VS 74LVC1G175GM,115
74LVC244ADB,118 VS 74LCX244MTCX
74LCX244WM VS 74LCX244MTCX
74LCX244TTR VS 74LCX244MTCX
74LCX244MTC VS 74LCX244MTCX
74HCT257D VS 74HCT257D,652
74HCT257D,653 VS 74HCT257D
74HCT157DTR2G VS 74HCT257D
74HCT132N,652 VS 74HC00D
74VHCT08AMTCX VS MM74HCT08M
74VHCT573AMTCX VS SN74AHCT573DGVRE4
74HC1G14GV VS 74HC1G14GV,125
74LVT2245WM VS SN74LVTH2245DBRG4
74LVT2245D,118 VS SN74LVTH2245DBRG4
74LVTH2245WMX VS SN74LVTH2245DBRG4
74LVTH2245WMX VS SN74LVTH2245DBR
74VHC16245TTR VS SN74AHC16244DGGR
74LCX244WMX VS 74LCX244MTCX
74ACT573SC VS CD74ACT573MG4
74ACT245MTCX VS 74ACT245MTCX
74HC04N VS SNJ54HC14J
74HC08D,653 VS 74HC08D
74HC08D,652 VS 74HC08D
74HC08N VS 74HC08D,652
74ACT273MTCX VS CD74ACT273PWE4
74ACT273MTC VS CD74ACT273PWE4
74ACT273SCX VS CD74ACT273SM96
74ACT273SCX VS MC74ACT377DWG
74F74SC VS 74HC74PW
74ABT244D VS 74LCX244MTCX
74LCX244WM VS 74ABT244D
74HC147D,652 VS 74HC147D-T
74HC147D VS 74HC147D-T
74HC147D,653 VS 74HC147D-T
74AHC273PW VS 74VHC273MTC
74AHC273PW VS 74LVX273MTC
74VCX86MTCX VS 74LCX86MTCX
74HCT640DB,112 VS CD74HCT640EE4
74LVC138APW,118 VS 74HCT238D
74HCT132D,653 VS 74HCT132D
74HCT132D VS 74HC00D
74HC240D,653 VS 74HC240D,652
74AHCT08D,118 VS MM74HCT08M
74VHC32M VS SN74AC32NSRE4
74HC138D VS 74HC138D,653
74HC32D VS 74HC32D,652
74HC32D VS MM74HC32MX
74HC32D VS MM74HC32M
74HC32D VS SN74HC7032D
74HC32D VS MC74HC32ADR2G
74HC32D VS 74AC32SCX
74HC32D VS 74AC32SC
74HCT132D,652 VS 74HCT132D
74AHC595PW,118 VS SN74AHC595PWE4
74LVXC4245MTR VS 74LVXC4245MTCX
74LV139D VS SN74LV139ADRE4
74LVT125PW VS SN74LVTH125PWR
74LVT125PW VS SN74LVTH125PW
74LVT125PW VS SN74LVT125QPWRQ1
74LVT125PW VS SN74LVT125QPWRG4Q1
74LVT125PW VS SN74LVT125QPWREP
74LVT125PW VS SN74LVT125PWR
74LVT125PW VS SN74LVTH125IPWREP
74LVT125PW VS SN74LVT125PW
74LVT125PW VS SN74LVTH125DGVR
74HCT74D VS MM74HCT74M
74HCT74D VS MM74HCT74MX
74HCT74N VS 74HCT74D
74LVC3G34DC,125 VS NC7NZ34K8X
74LVC3G34DC,125 VS 74LVC3G34DC,125
74LV74PW VS 74LVX74MTCX
74LV74PW VS 74LVX74MTC
74AUC1G126DBVRG4 VS NC7SP126P5X
74LCX541MTC VS SN74LVC541AQPWREP
74LV74PW,118 VS 74LVX74MTCX
74LV74PW,118 VS 74LVX74MTC
74LVC1G00GW,125 VS NC7SZ00M5X
74VHCT00AM VS 74VHC00MX
74VHCT08AMX VS MM74HCT08M
74VHCT08AMX VS MM74HCT08MX
74V1G14STR VS SN74AHC1G04DBVR
74V1G14STR VS SN74AHC1G04DBVRE4
74HCT03D VS CD74HCT03ME4
74HC138BQ VS 74HC138D,653
74LVC2G00DC,125 VS NL27WZ00US
74LVC125AD VS 74LVC125AD,112
74LVC1G04GW-G VS 74LVC1G04SE-7
74LV02D,118 VS SN74LV02ADBRG4
74LVC240AD,118 VS SN74LVC240DW
74LCX240WM VS SN74LVC240DW
74F08SC VS N74F08D
74HCT534D VS 74HCT540D
74HC573D,653 VS 74HC573D,652
74HCT08D,653 VS MM74HCT08M
74HC191D,653 VS 74HC191D
74VHCU04MX VS 74VHCU04M
74LVC07APW VS 74LVC07APW,118
74HC74PW,118 VS 74HC74PW
74LVC2G08DC,125 VS SN74LVC2G08DCURE4
74LVC1G08GW VS 74LVC1G08GW,125
74LVC1G08GW VS 74LVCE1G08SE-7
74ACT11244PWR VS 74ACT11240DBR
74ACT11245DWR VS 74ACT11240DBR
74AHC245D,118 VS SN74AHC245QDWRG4
74LVCH16245ADG VS 74LVCH162245ADG-T
74LVCH162245ADG-T VS 74LVCH16245ADGG,11
74LVCH162245ADG-T VS 74LVC162245ADGG,11
74LVCH162245ADGG,1 VS 74LVCH162245ADG-T
74LCXZ16245MTDX VS 74LVCH162245ADG-T
74LCX16245MEAX VS 74LVCH162245ADG-T
74LCX16245MEA VS 74LVCH162245ADG-T
74LVC2G14GW,125 VS 74LVC2G14GW
74LVC2G14GW,125 VS NC7WZ07L6X
74ACT00SCX VS 74ACT00SC
74AHCT574PW,118 VS 74VHCT574AMTCX
74AHCT574PW,118 VS MC74VHCT574ADTR2
74LCX244WM VS 74LCX244MTCX
74LCX244MTC VS 74LCX244MTCX
74AHC1G126GW,165 VS 74AHC1G126GW,125
74HC165D VS 74HC165D,653
74VHCT541AMTCX VS 74VHCT541AMTC
74AHCT541PW,118 VS 74VHCT541AMTC
74AC08SCX VS 74AC08SCX
74AC04SC VS 74AC04SCX
74AC04MTR VS 74AC04SCX
74HCT74D,653 VS MM74HCT74M
74HCT74D,653 VS MM74HCT74MX
74HCT74N VS 74HCT74D,653
74AC08SC VS 74AC08SC
74HC4075D,652 VS 74HC4075DB,118
74HC373DTR2G VS MM74HC373MTC
74HC373DTR2G VS SN74HC373PWT
74HC373DTR2G VS MC74HC373ADTR2G
74HC373DTR2G VS 74HC373PW
74HC373PW,118 VS 74HC373DTR2G
74HC373DTR2G VS MC74HC373ADTG
74HCT04D VS 74HCT04D,652
74LVC14APW VS 74LVC14APW,118
74LVC14APW VS SN74LVC14APWRE4
74LVC14APW VS SN74LVC14APWRG4
74LVC14APW VS SN74LVC14AQPWREP
74LVC14APW VS SN74LVC14APWRG3
74LVC14APW VS SN74LVC14AQPWRQ1
74HC11PW,118 VS M74HC11TTR
74AHCT574PW,118 VS SN74AHCT574DGVRG4
74ACT32MTCX VS SN74ACT32PWG4
74HC27D,653 VS SN74HC27DBRG4
74HCT573N,652 VS 74HCT573N
74LVC1G04GW,125 VS NC7SZ05M5X
74LVC1G04GW,125 VS NC7SZ14M5X
74LVC1G04GW,125 VS NC7SZ04M5X
74LVC1G04GW,125 VS NC7SZ14M5
74LCX244WMX VS 74LCX244WM
74LCX244WMX VS 74LCX244MTCX
74HC365D,653 VS SN74HC365DRE4
74HC244PW,118 VS 74HC244PW
74HC132D,652 VS 74HCT132D
74ACT138SC VS 74HCT238D
74LVC1G175DBVRE4 VS 74LVC1G175GM
74ACT273MTCX VS CD74ACT273SM96E4
74ACT273SJ VS CD74ACT273PWE4
74HC164PW VS M74HC164TTR
74ACT273SJX VS CD74ACT273PWE4
74LVC08APW-T VS 74LVC08APW,118
74LVC08APW,112 VS 74LVC08APW-T
74ABT640DB,112 VS SN74ABT640DW
74LVCH244APW,118 VS 74LCX244MTCX
74LCX244WM VS 74LVCH244APW,118
74ABT244D VS 74LCX244MTCX
74ABT244D VS 74LCX244WM
74HC1G04GW VS MC74HC1G04DFT1
74HC1G04GW VS 74HC1G04GW,125
74HC10D,653 VS 74HC10D,652
74AVC4T245RGYRG4 VS SN74AVC4T245PWRG4
74AVC4T245RGYRG4 VS SN74AVC4T245DR
74AVC4T245RGYRG4 VS SN74AVC4T245DGVR
74AVC4T245RGYRG4 VS SN74AVC4T245PWT
74AVC4T245RGYRG4 VS SN74AVC4T245D
74HC273D-T VS 74HC273D
74HC273BQ,115 VS 74HC273D-T
74HC273BQ,115 VS 74HC273BQ
74HC273BQ VS 74HC273D,652
74HC273BQ VS 74HC273D
74HC273D,653 VS 74HC273BQ
74HC4050D,652 VS 74HC4050D,652
74HC4050D,652 VS 74HC4050D
74HC4050N,652 VS 74HC4050D,652
74VHC20MTR VS TC74VHC20FN
74HCT244PW,118 VS MM74HC244MTC
74HCT08D VS MM74HCT08MX
74HCT08D VS SN74AHCT08QDRQ1
74LVXC4245MTR VS 74LVX4245MTC
74LVC125APW,118 VS 74LVC125APW
74LVC125APW VS 74LVC125AT14-13
74VCX86MTCX VS MC74LCX86DTR2G
74VCX86MTCX VS SN74LVC86APWRG4
74VCX86MTCX VS SN74LVC86APWG4
74VCX86MTCX VS SN74LVC86APW
74VCX86MTCX VS 74LCX86MTC
74HC1G14GW,125 VS 74AHC1G14GW
74AHC1G14GW,125 VS 74AHC1G14GW
74LVC2G240DCURE4 VS NC7WZ240K8X
74HC574D-T VS MM74HC573SJ
74LVC1G175DCKRG4 VS NC7SZ175P6X
74LVC1G175DCKTG4 VS NC7SZ175P6X
74HCT640DB,112 VS M74HCT640B1R
74AHCT1G04GW,125 VS 74HCT1G04GW,125
74ABT541D,602 VS 74HCT373D,653
74LCX646TTR VS SN74LVC646ADBRE4
74FCT162652ATPVCT VS SN74ABT16952DLG4
74FCT162652ATPVCG4 VS SN74ABT16952DLG4
74LVC138APW,118 VS 74HCT238D
74HCT139D VS 74HCT238D
74AC138SCX VS 74HCT238D
74HCT238D VS 74AC138MTC
74HC132D VS 74HCT132D
74HC132D,653 VS 74HCT132D
74HCT132D VS 74HC00D
74HC00D VS 74HCT132D
74LV14D,118 VS 74LV14D,112
74ALVC32PW,118 VS 74ALVC32PW,118
74LVC1G126GV,125 VS 74LVC1G126GW
74HCT132D,652 VS 74HCT132D
74HCT244D VS CD74HCT244M96E4
74AHC1G04GW VS 74AHC1G04GV,125
74HCT244D,653 VS CD74HCT244M96E4
74VHCT08AMX VS MM74HCT08M
74VHCT08AMX VS MM74HCT08MX
74HC03D VS 74HC03D,652
74HC03D,653 VS 74HC03D,652
74ACT244TTR VS MC74ACT244DT
74LVC125AD,112 VS 74LVC125AD,118
74F08SCX VS N74F08D
74HC574N VS M74HC574B1R
74ACT14SC VS SN74ACT14DRE4
74ACT11244PWR VS 74ACT11240DWR
74ACT11245DWR VS 74ACT11240DWR
74ACT14SCX VS SN74ACT14DRE4
74AHC245D,118 VS SN74AHC245DWE4
74LCX16646MEA VS SN74LVC16646ADLG4
74LVT244APW,112 VS SN74LVTH244AQPWREP
74HC27D VS SN74HC27DBRG4
74LVC00APW,118 VS SN74LVC00APWTG4
74LVC00APW VS 74LVC00APW,118
74LVC00APW,118 VS 74LVC00APW-T
74AHC1G14GW,125 VS 74AHC1G14GW
74HC1G14GW,125 VS 74AHC1G14GW
74HC1G04GV,125 VS 74HC1G04GW,125
74HC1G04GV VS 74HC1G04GW,125
74HC244DB,118 VS 74HC244DB,118
74HC244DB,112 VS 74HC244DB,118
74HC244DB VS 74HC244DB,112
74LVT10D,118 VS 74LVT10D,112
74LVT10DB,112 VS 74LVT10D,118
74LVT14DB VS 74LVT14DB,118
74LVT14DB,112 VS 74LVT14DB,118
74LVT14D VS 74LVT14DB,118
74LVT14D,118 VS 74LVT14DB,118
74LVT14D,112 VS 74LVT14DB,118
74LVT14D-T VS 74LVT14DB,118
74ACT04SC VS 74ACT04SC
74LVQ04SCX VS 74ACT04SC
74LVQ04SCX VS 74ACT04SCX
74ACT04SCX VS 74ACT04SCX
74AC157SCX VS 5962-9764201QFA
74LVT10DB,118 VS 74LVT10DB,112
74LVT10DB,112 VS 74LVT10D,112
74LVT245PW VS 74LVTH245MTCX
74LVT245PW VS 74LVT245MTC
74LVT00DB,118 VS 74LVT00D
74LCX574TTR VS MC74LCX574DT
74LVC244APW,118 VS 74LVC244APW,118
74LVC244APW,118 VS 74LVC244APW,112
74LVC244APW,118 VS SN74LVC244APWRG3
74LVC244APW,118 VS SN74LVC244APWRG4
74LVC244APW,118 VS CLVC244AQPWRG4Q1
74LVC244APW,118 VS SN74LVC244APWT
74LVC244APW,118 VS SN74LVC244AQPWRQ1
74LVC244APW,118 VS SN74LVC244APW
关注
关注采芯网
回复型号,查元件信息
采芯网 FindIC 用户意见反馈
尊敬的用户您好!采芯网一直致力于持续提升网站的服务质量,我们希望您能提供使用网站时遇到问题和建议!
问题类型
网站页面问题或建议
数据问题或错误
元器件采购询价
其他
意见建议
联系方式
反馈和联系